Improve at university level (7)
I believe the answer is:
upgrade
'improve' is the definition.
(thesaurus)
'at university level' is the wordplay.
'at university' becomes 'up'.
'level' becomes 'grade' (grading is a kind of levelling**).
'up'+'grade'='UPGRADE'
(Other definitions for upgrade that I've seen before include "Improve, enhance" , "Get better software" , "promotion" , "Bonus for plane passenger" , "Raise to higher rank, or improve equipment" .)